If you are having trouble getting Google Assistant or Home to control your lights properly (i.e. the Panels are consistently not responding), you can try the following steps in order to set this back up:

Unplug the Light Panels, wait 10 seconds and then plug back in

Sign out of your Nanoleaf Account on the Nanoleaf App and Sign back in. Also ensure that the “Sync with Nanoleaf Cloud” button is pressed after signing in

Unlink the Nanoleaf skill in the Google Home/Assistant App and re-link it